title: [Use, in craniology, of vectors for the demonstration of the degree of forehead and face inclination in the chimpanzee and present-day and fossilized man].
abstract: It is demonstrated, by mathematical method using vectors, that: (1) the inclination of the forehead, the sign of which is negative (simian type) in all Apes studied here, changes its sign and becomes positive (human type) in Plesianthropus, La Ferrassie I and contemporary Man. It remains negative (simian type) in Sinanthrope XI and La-Chapelle-aux-Saints; (2) the inclination of the face has a positive sign (simian type) in all Apes and Plesianthropus, but becomes negative (human type) in the genus Homo; (3) the fronto-gnathic angle which always remains less than 90 degrees in all Simians, becomes greater than 90 degrees in the genus Homo, and Plesianthropus.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D001703:Biophysics; D002508:Cephalometry / Q000379:methods*; D005145:Face / Q000033:anatomy & histology*; D005546:Forehead / Q000033:anatomy & histology; D005580:Fossils; D000882:Haplorhini / Q000033:anatomy & histology*; D049690:History, Ancient; D006801:Humans; D002679:Pan troglodytes / Q000033:anatomy & histology*
vernacular_title: Utilisation, en craniologie, des vecteurs pour la mise en évidence du degré d'inclinaison du front et de la face chez le chimpanzé, l'homme actuel et fossile.